Encyclopedia of Microtonal Music Theory

third / 3rd / diatonic-3rd

[Joe Monzo]

A diatonic interval which traverses 2 steps in a diatonic scale, and covers a pitch distance bounded by 3 nominals inclusively. This refers to the generic usage of "3rd" without a qualifying adjective, which often precedes the interval name in standard diatonic usage. Thus, the various different types of diatonic 3rds are (in order of size from smallest to largest):

diminished-3rd

minor-3rd

major-3rd

augmented-3rd

. . . . . . . . .

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